Modified Polyaspartic Acids for Dishwashing Detergents
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Solution Overview
Problem
Current biodegradable polymers for automatic dishwashing detergents, such as polyaspartic acid, face challenges in molecular weight and structure variability, cost, and complexity in manufacturing, limiting their effectiveness and flexibility in application.
Innovation Solution
Modified polyaspartic acids are produced through polycondensation of aspartic acid with carboxyl-containing compounds and subsequent hydrolysis with a base, allowing for variable molecular weights between 1,000 and 10,000 g/mol, and incorporation into dishwashing detergent compositions with additional additives for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyaspartic acid is used as a biodegradable alternative to polycarboxylates, then biodegradability is improved, but molecular weight and structure variability is limited
Solution Approach 1:
The patent applies parameter changes by systematically varying the molecular weight of polyaspartic acid across a wide range (1,000 to 10,000 g/mol) and adjusting the degree of neutralization (50-100%). This allows optimization of detergent performance for different applications while maintaining biodegradability, directly resolving the contradiction between biodegradability and structural variability.
2Reliability
If polyaspartic acid is produced through conventional processes, then biodegradability is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent simplifies manufacturing by controlling polymerization parameters to achieve target molecular weights (1,000-10,000 g/mol) directly during synthesis, avoiding complex post-polymerization modification steps. This reduces manufacturing complexity while maintaining biodegradability and achieving the desired performance characteristics.
3Manufacturing precision
If polyaspartic acid molecular weight is increased to improve dispersing performance, then dispersing ability is improved, but biodegradability may be reduced
Solution Approach 1:
The patent establishes an optimal molecular weight range (1,000-10,000 g/mol) that balances dispersing performance and biodegradability. Within this range, the polymer achieves sufficient molecular weight for effective dispersing and deposit inhibition while remaining small enough to be readily biodegraded by microorganisms in sewage treatment systems, thus resolving the contradiction between performance and biodegradability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modified polyaspartic acids exhibit excellent dispersing, deposit inhibiting, and spot inhibiting properties while being biodegradable, offering improved usability and production flexibility, thus addressing the limitations of existing polymers.
Implementation Method 1
The modified polyaspartic acids used in connection with the present invention can be produced by polycondensation of (i) 50 to 99 mol% aspartic acid; and (ii) 1 to 50 mol% of at least one carboxyl-containing compound
Implementation Method 2
subsequent hydrolysis of the cocondensates with the addition of a base
Data Source
AI summary
The present invention relates to the use of modified polyaspartic acids in dishwashing detergents, more particularly as dispersants, encrustation inhibitors and spot inhibitors. The invention also relates to dishwashing detergent compositions containing modified polyaspartic acids.